Partitioning and desorption behavior of polycyclic aromatic hydrocarbons from disparate sources

The Science of the Total Environment
W R ReevesK C Donnelly

Abstract

Contaminated sediments pose a unique challenge for risk assessment or remediation because the overlying water column may transport contaminants offsite or to ecological receptors. This research compares the behavior of polycyclic aromatic hydrocarbons (PAHs) on marine sediments from two sites. The first site was affected by shipping activities and the second was impacted by a creosote seep. Organic carbon:water partitioning coefficients (Koc values) were measured with three solutions. Desorption was measured using Tenax beads. PAHs from the ship channel had lower Koc values than those from the creosote facility. For example, the average logKoc value of ship channel pyrene was significantly lower than that of creosote facility pyrene (4.39 +/- 0.35 and 5.29 +/- 0.09, respectively, when tested in 5 mM calcium chloride). These results were consistent with the greater desorption of pyrene, phenanthrene and benzo(a)pyrene from the ship channel than from the creosote facility sediments. Organic compound desorption from sediments can be considered to be a two-stage process, with a labile fraction that desorbs quickly and a refractory fraction that desorbs much more slowly. In both sediments, more than 75% of the benzo(a)pyrene was fou...Continue Reading

References

Jan 25, 2003·Environmental Science & Technology·Amymarie Accardi-Dey, Philip M Gschwend
Dec 6, 2003·Environmental Science & Technology·Michiel T O JonkerAlbert A Koelmans

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Citations

Nov 2, 2013·The Science of the Total Environment·Christophe BarnierJean Louis Morel
Jul 4, 2007·Journal of Environmental Monitoring : JEM·Abdulwaheed S AhmedColin F Moffat
Sep 24, 2008·Risk Analysis : an Official Publication of the Society for Risk Analysis·Göran Bengtsson, Niklas Törneman
Nov 21, 2009·Environmental Science & Technology·Justin E Birdwell, Louis J Thibodeaux

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